source file of the Flower Library
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-
#ifndef VIRTUAL_METHODS_HH
#define VIRTUAL_METHODS_HH
- #include <typeinfo>
-#include "stdlib.h" // size_t
+#include <typeinfo>
+using namespace std;
-#define classname(class_ptr) demangle_classname(typeid(*(class_ptr)))
+#define classname(class_ptr) demangle_classname (typeid (* (class_ptr)))
-const char *
+char const *
demangle_classname (type_info const &);
-/**
+/*
+
+Virtual copy constructor. Make up for C++'s lack of a standard
+factory or clone () function. Usage:
- Virtual copy constructor. Make up for C++'s lack of a standard
- clone() function. Uses a typeof hack. Usage:
+class Foo : Baseclass
+{
+VIRTUAL_COPY_CONSTRUCTOR (Baseclass, Foo);
+};
- class Foo : Baseclass {
- VIRTUAL_COPY_CONS(Baseclass);
- };
-
- */
+*/
-// fix constness: gcc-2.95 is correct in defining
-// typeof (*this)
-// in a const member function to be const
+#define DECLARE_CLASSNAME(name) \
+ virtual const char *class_name () const { \
+ return #name; \
+}
-#if 0
-#define VIRTUAL_COPY_CONS(base) \
- virtual base *clone () const \
- { \
- return new typeof(*this) (*this); \
+#define VIRTUAL_COPY_CONSTRUCTOR(Base, name) \
+ DECLARE_CLASSNAME(name);\
+ virtual Base *clone () const \
+ { \
+ return new name (*this); \
}
-#else
-#define VIRTUAL_COPY_CONS(base) \
- virtual base* clone_const_helper () \
- { \
- return new typeof (*this) (*this); \
- } \
- virtual base* clone () const \
- { \
- base* urg = (base*)this; \
- return urg->clone_const_helper (); \
- }
-#endif
#endif /* VIRTUAL_METHODS_HH */